This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...vicinity of the shore line, or within the area of currents that carried flue sediment farther out from the shore. MIDDLE CAMBRIAN LAND. There is little definite data for the construction of a map of the continent during Middle Cambrian time. The narrowing of the land areas that existed at the beginning of Cambrian time ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...vicinity of the shore line, or within the area of currents that carried flue sediment farther out from the shore. MIDDLE CAMBRIAN LAND. There is little definite data for the construction of a map of the continent during Middle Cambrian time. The narrowing of the land areas that existed at the beginning of Cambrian time, and the probable presence of a barrier between the Atlantic coast and Appalachian provinces iipears to be all the changes recorded. The latter is supposed to have prevented the Paradoxides fauna of the Atlantic coast province from penetrating into the Appalachian trough, either to the north in the St. Law rence and Champlain valleys or along the line of the southern PaleoAppalachians. The possible exception to this is in the southern limit in Alabama, where a few types of Paradoxides fauna of Newfoundland and Sweden occur in association with the characteristic Middle Cambrian fauna of the Appalachian and Rocky Mountain provinces. The presence of this fauna indicates that there was a line of communication between the North Atlantic province and the southern portion of the Appalachian trough, to the eastward of the Paleo-Appalachian barrier, during Middle Cambrian time. Owing to the fact that the Middle Cambrian zone is differentiated from the Lower and Upper in the great Paleo-Appalachian and PaleoRocky Mountain troughs, and that its upper zone occurs in the Interior Continental area, a map of these provinces from existing data would show a deep contraction of the margins of the central area and a slight narrowing of the bordering ridges. During the field season of 1891 I had the opportunity of examining sections of the Cambrian rocks in Virginia, Tennessee, Georgia, and Alabama. Special attention was given to the middle zone, as the data upo...
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Add this copy of The North American Continent During Cambrian Time to cart. $19.00, very good condition, Sold by Blue Heron Books rated 4.0 out of 5 stars, ships from Claremont, CA, UNITED STATES, published 1891.
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Seller's Description:
VG. No Jacket. 4to. Rebound with Joseph Paxon Iddings, The Eruptive Rocks of Electric Peak and Sepulchre Mountain, Yellowstone National Park. (pp 569-670). Preceded in binding by the last 10 pages of 'The Lafayette Formation' paper. Apparently these papers were rebound from p. 523-568. Clean and unworn hardbound (with leather-like binding) copy with foldout charts and maps. A classic in the fields of geology and paleontology.
Add this copy of The North American Continent During Cambrian Time to cart. $26.00, very good condition, Sold by Xerxes Books rated 5.0 out of 5 stars, ships from Glen Head, NY, UNITED STATES.
